Mitsubishi Electric FR-F800 Series Instruction Manual page 561

5.13.8 DC injection brake
• Adjust the braking torque and timing to stop the motor using the DC injection brake.
By the DC injection brake operation, DC voltage is applied to the motor to prevent rotation of the motor shaft. When a motor
shaft is rotated by external force, the motor shaft does not go back to the original position.
Pr.
10 DC injection brake
G100 operation frequency
11 DC injection brake
G101 operation time
12 DC injection brake
G110 operation voltage
*1 The initial value for the FR-F820-00340(7.5K) or lower and FR-F840-00170(7.5K) or lower.
*2 Initial value for the FR-F820-00490(11K) to FR-F820-02330(55K), and the FR-F840-00250(11K) to FR-F840-01160(55K).
*3 Initial value for the FR-F820-03160(75K) or higher and FR-F840-01800(75K) or higher.
 Setting of operating frequency (Pr.10)
• By setting the frequency to operate the DC injection brake to Pr.10 DC injection brake operation frequency, the DC
injection brake will operate when it reaches this frequency at the time of deceleration.
• When Pr.10 = "9999", DC injection brake will start when the frequency reaches Pr.13 Starting frequency.
• The DC injection brake operation frequency depends on the stopping method.
Stopping method
Press the STOP key on the operation panel.
Turn OFF the STF/STR signal.
Set frequency to 0 Hz
• The DC injection brake operation frequency will be fixed to 0 Hz under PM motor control.
 Setting of operation time (X13 signal, Pr.11)
• Set the operation time for the DC injection brake in Pr.11 DC injection brake operation time.
• When the motor does not stop due to large load moment (J), increase the setting to ensure the effect.
• The DC injection brake operation is not available when "0" is set in Pr.11. (The motor will coast to stop.)
• When Pr.11 = "8888", DC injection brake will operate when the X13 signal is turned ON. DC injection brake will operate
when the X13 signal is turned ON even while operating.
560
5. PARAMETERS
5.13 (G) Control parameters
Downloaded from ManualsNet.com
Name Initial value Setting range
0 to 120 Hz
3 Hz
9999
0
0.5 s 0.1 to 10 s
8888
*1
4%
*2
0% to 30%
2%
*3
1%
0.5 Hz or higher in Pr.10
Lower than 0.5 Hz in Pr.10, and 0.5 Hz or
higher in Pr.13
Lower than 0.5 Hz in both Pr.10 and Pr.13
—
DC injection
brake
voltage
search engine
Set the operation frequency for the DC injection brake.
The operation starts at the frequency set in Pr.13 or lower.
Without DC injection brake.
Set the operation time for the DC injection brake.
The operation continues while the X13 signal is ON.
Set the DC injection brake voltage (torque). When set to "0", the DC
injection brake is not applied.
Parameter setting
Pr. 10 Operation
frequency
Time
Pr.12
Operation
voltage
Time
Pr. 11 Operation time
Description
DC injection brake operation frequency
Pr.10 setting
0.5 Hz
Pr.10 or Pr.13 setting, whichever larger
Pr.13 setting or 0.5 Hz, whichever smaller